In fact, property tax records show Kuster has been delinquent on more than $40,000 in property taxes over the last three years. For her primary residence, she’s been delinquent on six different, consecutive assessments. For the most part, Kuster and her husband do eventually pay these bills along with a penalty.

When she was sworn in to Congress in early January, Kuster owed $14,089.32 in delinquent property taxes on her Hopkinton home. She has since made a tax payment and currently owes $6,998.22 in past-due property taxes on that property. This pattern of not paying her taxes dates back to 2010, according to the records. On the property in Jackson, she didn't pay either of the semi-annual tax bills in 2012 and owes $3,851.65.

While owing these taxes, Kuster also filed a required personal-finance disclosure form that lists a broad range of personal assets. Using this form, the Center for Responsive Politics estimated her net worth to be around $1.8 million. As a member of Congress, she receives an annual salary of $174,000.

Kuster spokesman Rob Friedlander didn't offer a reason why the Kusters were so often behind in paying property taxes. However, the period in question was when Kuster stopped being a practicing attorney and started being a full-time congressional candidate.

Instead, Friedlander said, "The Kusters are in the process of making these payments in full with interest."

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